... institutions,very easy for the installation and maintenance of pipes. 2:Excutive Standard standard for design,process,test:GB ... body,Gland,Limited short pipe.Carbon steel,Quality carbon steel,Nodular cast iron,Stainless steel.Q235-A,20,35,45,QT400- ... 1998GB/T3280-1992Bolt,Stud,Power Screw,Nut.Carbon steel,Quality carbon steel,stainless steelQ235A,35,45,00Cr17Ni14Mo2,1Cr18Ni10TiGB/T4237-1992GB/T700 ...